$16a^2+72ac+81c^2$
$3x+\frac{x}{2}$
$\left(\sin x-\cos x\right)\left(\sin x+\cos x\right)$
$\:sen\:\alpha+cosec\:\alpha$
$h^2+3h=30$
$350.250\:-74.000$
$\lim_{x\to\infty}\frac{2e^x}{\left(e^x-5\right)}$
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